Bottle stopper



FIG. 1 is a front view of the bottle stopper;

FIG. 2 is a rear view of the bottle stopper;

FIG. 3 is a top view of the bottle stopper;

FIG. 4 is a bottom view of the bottle stopper; and,

FIG. 5 is a side view of the bottle stopper. 

The ornamental design for a bottle stopper, as shown and described. 